Question about 1999 Ford Ranger SuperCab

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A/c doesn't work, temp gauge doesn't work, speedometer doesn't work until it gets to 30 mph, and rough idle in the mornings. could all this be the result of a bad computer?

A/C doesn't work, temp gauge, speedometer doesn't work until it gets to 30 mph, and rough idle especially when cold. Could all these things be the result of a bad computer?

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Very unlikely that it would be a computer problem, it does not control the A/C, or temp gauge. Sounds like multiple problems. A/C could be just low on Freon, if pressure is low, it will not turn on. Temp gauge and rough idle may be related, if temp sensor is bad, the computer wont know the engine temperature and thus not mix the fuel correctly. But there are many things that can cause rough cold engine idle, like dirty throttle plate, or bad idle air control valve. You did not say what engine you have, so this is just general information.

Posted on Jan 29, 2015

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SOURCE: 99 f250 SD 7.3

Your speed sensor in your trans. needs to be checked out sounds like its not working or not getting a good signal until its generating enough power and speed to start until it reaches 30 MPH. Check that out sometimes it could just be some dirt on it. It all makes sense the ABS light is on because its not reading the speed of the tires, and the AOD light is on because It has no idea when to shift into overdrive without knowing how fast its going. I sure Hope that Helps You Out, And Thanks, Bear001

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SOURCE: Transmission won't shift properly (2 wd ) speedo does not work

Its weird but I had a fuse blow out awhile back that is the same fuse that works the cab lights when you open the doors. When this fuse went out it also made it shift odd and hard when it did shift. Since it is only intermittent in your case, It may just be a weak fuse.

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SOURCE: 2004 F150 5.4L engine misfire

The concern is likely caused by the coil which sits on top of the spark plug. Your P0301 indicated misfire on cylinder 1. Your P0316 indicated it occurs on the first 1000 revolutions. Your P0171 indicated lean on bank one. Bank one includes cylinders 1,2,3 and 4. Your lean code is strange but could be related to misfire. I would recommend swap the coil on number one with number two. Clear the code and drive it. I would expect to see a P0302 which indicates the misfire traveled with bad coil. good luck.

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sounds like a fuse

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SOURCE: my temp gauge and fuel quit working

This is pretty common on the 2005 Mustangs, it's caused by failing stepper motors in the instrument cluster, they control the movement of the gauges. Repair is around $180 and there's a guide on how to fix them yourself here - 2005 Mustang speedometer problem

Posted on Oct 25, 2010

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